0512随机4位验证码

package com.text_1;

import java.util.Random;

public class yanzhengma {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		
		//随机4位验证码
		
		Random  num=new Random();
		int arr[]=new int[2];
		Random zimu=new Random();
		String str="abcdefghijklmnopqistuvwxyz";
		int arr1[]=new int[2];
		for (int i=0;i<2;i++)
		{
			arr[i]=num.nextInt(10);
			System.out.print(arr[i]);
			arr1[i]=zimu.nextInt(26);
			System.out.print(str.substring(arr[i], arr[i]+1));
		}	

	}

}